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Self-assembly and dynamic behavior of colloidal rods in the isotropic phase

Kamal, Md Arif LU ; Zinn, Thomas and Pal, Antara LU (2026) In Physical Review Research 8(1).
Abstract

In this study, we have investigated the dynamic behavior of colloidal rods within their isotropic phase, employing multispeckle ultrasmall-angle x-ray photon correlation spectroscopy (UA-XPCS) focusing on the understanding of the interplay between structure and dynamics at the nearest-neighbor length scale. While prior research has primarily focused on the structural aspects, our work addresses the lesser-explored realm of dynamic behavior. Through ultrasmall-angle x-ray scattering and UA-XPCS, we have measured the key parameters, such as the effective structure factor (Seff(q)) and the effective diffusion coefficient (Deff(q)). A significant finding is the scaling relationship between Deff(q) and... (More)

In this study, we have investigated the dynamic behavior of colloidal rods within their isotropic phase, employing multispeckle ultrasmall-angle x-ray photon correlation spectroscopy (UA-XPCS) focusing on the understanding of the interplay between structure and dynamics at the nearest-neighbor length scale. While prior research has primarily focused on the structural aspects, our work addresses the lesser-explored realm of dynamic behavior. Through ultrasmall-angle x-ray scattering and UA-XPCS, we have measured the key parameters, such as the effective structure factor (Seff(q)) and the effective diffusion coefficient (Deff(q)). A significant finding is the scaling relationship between Deff(q) and 1/Seff(q), implying a connection between particle diffusion and structural arrangement. Additionally, the estimated scaling parameter (effective amplitude function, Aeff(q)), which can be directly related to the effective hydrodynamic function (Heff(q)) shows a similar dependence on wave vector (q) as Seff(q). Furthermore, our study precisely determines the volume fraction at which the arrest transition occurs. These findings shed light on the influence of structures on the intricate dynamics of anisotropic colloidal systems.

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Please use this url to cite or link to this publication:
author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Research
volume
8
issue
1
article number
013341
publisher
American Physical Society
external identifiers
  • scopus:105036495107
ISSN
2643-1564
DOI
10.1103/5cbx-gnc4
language
English
LU publication?
yes
id
280d6cee-660a-4cd5-b1bc-e8dbe281e9f2
date added to LUP
2026-05-19 12:45:23
date last changed
2026-05-19 12:46:15
@article{280d6cee-660a-4cd5-b1bc-e8dbe281e9f2,
  abstract     = {{<p>In this study, we have investigated the dynamic behavior of colloidal rods within their isotropic phase, employing multispeckle ultrasmall-angle x-ray photon correlation spectroscopy (UA-XPCS) focusing on the understanding of the interplay between structure and dynamics at the nearest-neighbor length scale. While prior research has primarily focused on the structural aspects, our work addresses the lesser-explored realm of dynamic behavior. Through ultrasmall-angle x-ray scattering and UA-XPCS, we have measured the key parameters, such as the effective structure factor (S<sub>eff</sub>(q)) and the effective diffusion coefficient (D<sub>eff</sub>(q)). A significant finding is the scaling relationship between D<sub>eff</sub>(q) and 1/S<sub>eff</sub>(q), implying a connection between particle diffusion and structural arrangement. Additionally, the estimated scaling parameter (effective amplitude function, A<sub>eff</sub>(q)), which can be directly related to the effective hydrodynamic function (H<sub>eff</sub>(q)) shows a similar dependence on wave vector (q) as S<sub>eff</sub>(q). Furthermore, our study precisely determines the volume fraction at which the arrest transition occurs. These findings shed light on the influence of structures on the intricate dynamics of anisotropic colloidal systems.</p>}},
  author       = {{Kamal, Md Arif and Zinn, Thomas and Pal, Antara}},
  issn         = {{2643-1564}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Research}},
  title        = {{Self-assembly and dynamic behavior of colloidal rods in the isotropic phase}},
  url          = {{http://dx.doi.org/10.1103/5cbx-gnc4}},
  doi          = {{10.1103/5cbx-gnc4}},
  volume       = {{8}},
  year         = {{2026}},
}